Answer:
C. They knew the importance of opening the interior with the rail lines.
Step-by-step explanation:
The Bourbon Triumvirate support the railroad because "they knew the importance of opening the interior with the rail lines."
The Bourbon Triumvirate consisted of Joseph E. Brown, Alfred H. Colquitt, and John B. Gordon. They all want development in the south particularly industrial development. Hence, knowing the importance of the railroad expansion to business and industrial development, they supported its construction and expansion.